feat!: migrate to ESM

.eslintrc.cjs

@@ -148,6 +148,12 @@ module.exports = defineConfig({
       rules: {
         '@typescript-eslint/triple-slash-reference': 'off'
       }
+    },
+    {
+      files: 'packages/vite/**/*.*',
+      rules: {
+        'no-restricted-globals': ['error', 'require', '__dirname', '__filename']
+      }
     }
   ]
 })

package.json

@@ -77,6 +77,7 @@
     "prompts": "^2.4.2",
     "rimraf": "^3.0.2",
     "rollup": "^2.72.1",
+    "rollup-plugin-esbuild": "^4.9.1",
     "semver": "^7.3.7",
     "simple-git-hooks": "^2.7.0",
     "sirv": "^2.0.2",

packages/plugin-vue-jsx/src/index.ts

@@ -1,7 +1,7 @@
 import { createHash } from 'crypto'
 import path from 'path'
 import type { types } from '@babel/core'
-import babel from '@babel/core'
+import * as babel from '@babel/core'
 import jsx from '@vue/babel-plugin-jsx'
 // @ts-expect-error missing type
 import importMeta from '@babel/plugin-syntax-import-meta'

packages/plugin-vue/src/style.ts

@@ -51,7 +51,7 @@ export async function transformStyle(
   }
 
   const map = result.map
-    ? formatPostcssSourceMap(
+    ? await formatPostcssSourceMap(
         // version property of result.map is declared as string
         // but actually it is a number
         result.map as Omit<RawSourceMap, 'version'> as ExistingRawSourceMap,

packages/vite/LICENSE.md

@@ -1648,7 +1648,7 @@ Repository: gulpjs/glob-parent
 
 ## http-proxy
 License: MIT
-By: Charlie Robbins
+By: Charlie Robbins, jcrugzz <jcrugzz@gmail.com>
 Repository: https://github.com/http-party/node-http-proxy.git
 
 > node-http-proxy

packages/vite/bin/vite.js

@@ -1,10 +1,10 @@
 #!/usr/bin/env node
-const { performance } = require('perf_hooks')
+import { performance } from 'perf_hooks'
 
-if (!__dirname.includes('node_modules')) {
+if (!import.meta.url.includes('node_modules')) {
   try {
     // only available as dev dependency
-    require('source-map-support').install()
+    await import('source-map-support').then((r) => r.default.install())
   } catch (e) {}
 }
 
@@ -41,7 +41,7 @@ if (debugIndex > 0) {
 }
 
 function start() {
-  require('../dist/node/cli')
+  return import('../dist/node/cli.js')
 }
 
 if (profileIndex > 0) {
@@ -50,7 +50,7 @@ if (profileIndex > 0) {
   if (next && !next.startsWith('-')) {
     process.argv.splice(profileIndex, 1)
   }
-  const inspector = require('inspector')
+  const inspector = await import('inspector').then((r) => r.default)
   const session = (global.__vite_profile_session = new inspector.Session())
   session.connect()
   session.post('Profiler.enable', () => {

packages/vite/index.cjs

@@ -0,0 +1,32 @@
+/* eslint-disable no-restricted-globals */
+
+// type utils
+module.exports.defineConfig = (config) => config
+
+// proxy cjs utils (sync functions)
+Object.assign(module.exports, require('./dist/node-cjs/publicUtils.cjs'))
+
+// async functions, can be redirect from ESM build
+const asyncFunctions = [
+  'build',
+  'createServer',
+  'preview',
+  'transformWithEsbuild',
+  'resolveConfig',
+  'optimizeDeps',
+  'formatPostcssSourceMap'
+]
+asyncFunctions.forEach((name) => {
+  module.exports[name] = (...args) =>
+    import('./dist/node/index.js').then((i) => i[name](...args))
+})
+
+// some sync functions are marked not supported due to their complexity and uncommon usage
+const unsupportedCJS = ['resolvePackageEntry', 'resolvePackageData']
+unsupportedCJS.forEach((name) => {
+  module.exports[name] = () => {
+    throw new Error(
+      `"${name}" is not supported in CJS build of Vite 3.\nPlease use ESM or dynamic imports \`const { ${name} } = await import('vite')\`.`
+    )
+  }
+})

packages/vite/package.json

@@ -1,18 +1,29 @@
 {
   "name": "vite",
   "version": "3.0.0-alpha.1",
+  "type": "module",
   "license": "MIT",
   "author": "Evan You",
   "description": "Native-ESM powered web dev build tool",
   "bin": {
     "vite": "bin/vite.js"
   },
-  "main": "dist/node/index.js",
-  "types": "dist/node/index.d.ts",
+  "main": "./dist/node/index.js",
+  "module": "./dist/node/index.js",
+  "types": "./dist/node/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/node/index.d.ts",
+      "import": "./dist/node/index.js",
+      "require": "./index.cjs"
+    },
+    "./*": "./*"
+  },
   "files": [
     "bin",
     "dist",
     "client.d.ts",
+    "index.cjs",
     "src/client",
     "types"
   ],
@@ -29,12 +40,12 @@
   },
   "homepage": "https://github.com/vitejs/vite/tree/main/#readme",
   "scripts": {
-    "dev": "rimraf dist && rollup -c -w",
+    "dev": "rimraf dist && pnpm run build-bundle -w",
     "build": "rimraf dist && run-s build-bundle build-types",
-    "build-bundle": "rollup -c",
+    "build-bundle": "rollup --config rollup.config.ts --configPlugin esbuild",
     "build-types": "run-s build-temp-types patch-types roll-types",
     "build-temp-types": "tsc --emitDeclarationOnly --outDir temp/node -p src/node",
-    "patch-types": "ts-node scripts/patchTypes.ts",
+    "patch-types": "esno scripts/patchTypes.ts",
     "roll-types": "api-extractor run && rimraf temp",
     "lint": "eslint --ext .ts src/**",
     "format": "prettier --write --parser typescript \"src/**/*.ts\"",
@@ -75,6 +86,7 @@
     "dotenv": "^14.3.2",
     "dotenv-expand": "^5.1.0",
     "es-module-lexer": "^0.10.5",
+    "esno": "^0.15.0",
     "estree-walker": "^2.0.2",
     "etag": "^1.8.1",
     "fast-glob": "^3.2.11",